Multiple Choice
How was osmosis involved in causing Clark's seizures?
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6. The Membrane
Osmosis
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In an experiment involving a selectively permeable membrane and solutions of starch and iodine, did starch diffuse through the membrane?
A
No, because the membrane is impermeable to all solutes.
B
Yes, starch diffused freely through the membrane.
C
Yes, but only in the presence of iodine.
D
No, starch molecules are too large to pass through the membrane.
Verified step by step guidance1
Understand the concept of selective permeability: A selectively permeable membrane allows certain molecules to pass through while blocking others based on size, charge, or other properties.
Recall the molecular size of starch: Starch is a polysaccharide composed of many glucose units, making it a large molecule compared to smaller molecules like iodine.
Consider the role of iodine: Iodine is a much smaller molecule and can diffuse through the membrane, but its presence does not change the size of starch molecules or the membrane's permeability to starch.
Analyze the experimental setup: If the membrane is selectively permeable and impermeable to large molecules, starch will not diffuse through it, regardless of the presence of iodine.
Conclude based on molecular size and membrane properties: Starch molecules are too large to pass through the selectively permeable membrane, which is why they do not diffuse in this experiment.
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